const mysql=require('mysql')
//连接数据库
const con=mysql.createConnection({
    port:'3306',
    host:'localhost',
    user:'root',
    password:'root',
    database:'list1'
})

con.connect()

function query(sql){
    return new Promise((resolve,reject)=>{
        con.query(sql,(err,data)=>{
            if(err){
                reject(err)
            }else{
                resolve(data)
            }
        })
    })
}

module.exports=query